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I'm getting this error when sending message (responding to user on the
mailing list).

Does someone has a small idea where I could start my investigation ?

I'm hosting my mail server on Cloudflare DNS but the MX record is in clear.

The mail server is using a reserved IP and it is serving many domain
name for email.

I was thinking that maybe I should start thinking about hosting my own
email server. But I wasn't sure if I felt like I had the nerve to do so.
Some people say it's a lot of maintenance work.

I don't want to use Google for my domain as a email provider, this is
too costly.

The actual hosting provider I use (Namecheap) does a great job, except
that because it's a shared hosting provider my mail often gets flagged
junk and seem to always raise some problem with DMARC compliance,
possibly relating to the above.


Start of the error message received by "returned mail" :

Reporting-MTA: dns; premium58.web-hosting.com

Action: failed
Final-Recipient: rfc822;bjoern.ricks@greenbone.net
Status: 5.0.0
Remote-MTA: dns; mail.greenbone.net
Diagnostic-Code: smtp; 550 X-Host-Lookup-Failed: Reverse DNS lookup
failed for (failed)

Polyna-Maude R.-Summerside
-Be smart, Be wise, Support opensource development

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